Plant characteristics?[huge pics]

Hey guys, new grower here. I was wondering if there are any plants that are known to have a pink/red stem and purple tipped leaves while growing. I thought it may have been a nutrient deficiency, but a 2nd plant under the exact same conditions is growing with no purple on the leaves and the stem is only slightly pink.

The 2nd plant is about 4 days younger than the first. I have some pics i can post of each if the forum will let me -.-. gave me shit all day yesterday about posting a thread.

1st plant vvv


2nd plant vvv

purple color means the temp. is low but it can also be genetics make sure temp is around 77 79 day 70 72 night dont feed any nutes till the 4 node the soil has enought nutrients its just a seedling dont go crazy

Yea I'm not 100%, but it shouldn't be getting under 70 at night, i have a space heater in the grow area and i just checked at like 4 am last night, when it was coldest, and it felt around 70-72. I THINK it may be genetics but i don't recall ever smoking anything purple when i was collecting the seeds

yea it happens speacially wen they are young
as long u dont go under than 65 u good but they look healthy and remeber about the nutes start slow plants dont grow any faster if u nute burn them it happend to me alot in the beggining cause i didnt listen wen people told me to go easy on nutes specially soil

Yea i haven't been using any right now. I've been reading a lot of guides about how to grow indoors and lurking around the forums for a week, i'm watchin my babies like a hawk and makin sure nothing is wrong with them =D i need somethin to smoke!

it seems to me the more i leav it alone the faster it grows i havnt smoke anything yet i'm almost having a heart attack

I hear that, i've been dry for like 6 months or more now, so I decided to do something to fix that